/Engine/Source/Runtime/Engine/Public/StaticMeshSceneProxy.h
Configures mesh batch vertex / index state. Returns the number of primitives used in the element.
uint32 SetMeshElementGeometrySource ( int32 LODIndex, int32 ElementIndex, bool bWireframe, bool bUseInversedIndices, bool bAllowPreCulledIndices, const [FVertexFactory](API\Runtime\RenderCore\FVertexFactory) * VertexFactory, [FMeshBatch](API\Runtime\Engine\FMeshBatch) & OutMeshElement ) const